OpenZFS 6529 - Properly handle updates of variably-sized SA entries

Porting notes:
- This issue was first fixed in ZoL by commit d862cb0d.  That fix was
then modified and an equivalent version of the patch landed in the
upstream code base.  For additional details see the discussion in
https://github.com/openzfs/openzfs/pull/24 .

This commit aligns ZoL with OpenZFS codebase.

Authored by: Andriy Gapon <[email protected]>
Reviewed by: Brian Behlendorf <[email protected]>
Reviewed by: Matthew Ahrens <[email protected]>
Reviewed by: Ned Bass <[email protected]>
Reviewed by: Tim Chase <[email protected]>
Approved by: Gordon Ross <[email protected]>
Ported-by: George Melikov [email protected]

OpenZFS-issue: https://www.illumos.org/issues/6529
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/e7e978b
Closes #5606 

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